Banana Upside Down Muffins

INGREDIENTS

non-stick cooking spray

4 tbsp

unsalted butter

1/2 cup

dark muscovado or brown sugar, packed (I used dark brown sugar)

ripe bananas

!Muffins:

1 cup

unbleached all-purpose flour, preferably organic

2 tsp

baking powder

1/2 tsp

freshly grated nutmeg

salt

1/2 cup

dark muscovado or brown sugar, packed

1/3 cup

canola oil

large eggs, room temperature

3 tbsp

whole milk

3 tbsp

dark rum

1 tsp

vanilla extract